db2 | 易学教程

Where do I download JDBC drivers for DB2 that are compatible with JDK 1.5?

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问题 Where do I download JDBC drivers for DB2 that are compatible with JDK 1.5? They seem to be very elusive and I hit many dead-ends at IBM's website. I managed to find versions of the driver bundled with some tools such as IBM Data Studio. Unfortunately, these versions either target a JVM too modern (JDK 1.6, leading to class version errors) or too ancient (JDK 1.2, leading to known bugs when run on JDK 1.5). 回答1: I know its late but i recently ran into this situation. After wasting entire day I

JPA 2.0 Provider Hibernate 3.6 for DB2 v9.5 type 2 driver is throwing exception in configuration prepration

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The JPA 2.0 Provider Hibernate is throwing exception while preparing configuration for entity manager factory, I am using DB2 v9.5 database and DB2 v9.5 JDBC type 2 driver . java.sql.SQLException: [IBM][JDBC Driver] CLI0626E getDatabaseMajorVersion is not supported in this version of DB2 JDBC 2.0 driver. at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throwNotSupportedByDB2(Unknown Source) at COM.ibm.db2.jdbc.app.DB2DatabaseMetaData.getDatabaseMajorVersion(Unknown Source) at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:117) at org.hibernate.cfg.Configuration

Why can't my As400 select from a newly created member alias?

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问题 I have set up the code as described in this question. Creating an alias works, as well as dropping it. For members that I have created myself, this is working correctly, but for existing members I get the following error when selecting from the alias: SQL State: 42704 Vendor Code: -204 Message: [SQL0204] MyMemberName in MyLib type *FILE not found. Cause . . . . . : MyMemberName in TPLWHS type *FILE was not found. If the member name is *ALL, the table is not partitioned. If this is an ALTER

What to use in DB2 for CURRENT_TIMESTAMP?

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问题 I am converting some of my MySQL statements to DB2 database, but I faced a problem on the following query CREATE TABLE RFX_EVENT_MAPPING ( EVENT_TYPE varchar(4) NOT NULL, EVENT_DESC varchar(50) NOT NULL, EVENT_CLASS varchar(50) default NULL, OWNER varchar(6) default NULL, LAST_UPDATE_TIME timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, LAST_UPDATE_USER varchar(20) NOT NULL ); As you can see there is LAST_UPDATE_TIME timestamp NOT NULL default CURRENT_TIMESTAMP on

分布式系统一致性(ACID、CAP、BASE、二段提交、三段提交、TCC、幂等性)原理详解

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1 背景一致性是一个抽象的、具有多重含义的计算机术语，在不同应用场景下，有不同的定义和含义。在传统的IT时代，一致性通常指强一致性，强一致性通常体现在你中有我、我中有你、浑然一体；而在互联网时代，一致性的含义远远超出了它原有的含义，在我们讨论互联网时代的一致性之前，我们先了解一下互联网时代的特点，互联网时代信息量巨大、需要计算能力巨大，不但对用户响应速度要求快，而且吞吐量指标也要向外扩展（既：水平伸缩），于是单节点的服务器无法满足需求，服务节点开始池化，想想那个经典的故事，一只筷子一折就断，一把筷子怎么都折不断，可见人多力量大的思想是多么的重要，但是人多也不一定能解决所有事情，还得进行有序、合理的分配任务，进行有效的管理，于是互联网时代谈论最多的话题就是拆分，拆分一般分为“水平拆分”和“垂直拆分”（大家不要对应到数据库或者缓存拆分，这里主要表达一种逻辑）。这里，“水平拆分”指的是同一个功能由于单机节点无法满足性能需求，需要扩展成为多节点，多个节点具有一致的功能，组成一个服务池，一个节点服务一部分的请求量，团结起来共同处理大规模高并发的请求量。“垂直拆分”指的是按照功能拆分，秉着“专业的人干专业的事儿”的原则，把一个复杂的功能拆分到多个单一的简单的元功能，不同的元功能组合在一起，和未拆分前完成的功能是一致的，由于每个元功能职责单一、功能简单，让维护和变更都变得更简单、安全

.net application cannot connect to DB2 DataBase

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问题 ERROR [08001] [IBM] SQL30081N A communication error has been detected. Communication protocol being used: "TCP/IP". Communication API being used: "SOCKETS". Location where the error was detected: "10.66.180.30". Communication function detecting the error: "connect". Protocol specific error code(s): "10061", " ", " ". SQLSTATE=08001 回答1: You have to download the driver directly from the IBM page ;) 回答2: There are a number of reasons for this error, your db2 is started? oyou have configured the

Connecting to DB2 via .NET DbConnection

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Our current DB Connection provider model relies on database connectivity to use DbConnection (System.Data) based objects. We can connect to DB2 (*Nix * Windows) via OdbcConnection, but we would like to allow the use of native DB2 Drivers. Is there any way to do so (either .Net framework, OpenSource or (last choice) vendor) without breaking away from our current DAL model? There is another method not mentioned in the article above, and that is to use DbNetData which simplifies database access and has the ability to connect to DB2 from .NET. The source is hosted on CodePlex below: DbNetData 来源：

Subquery to return the latest entry for each parent ID

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how to run db2 sql command from a command line?

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问题 how can I run sql command UPDATE CONTACT SET EMAIL_ADDRESS = 'mytestaccount@gmail.com' via command line for db2 database on linux from a shell script file? 回答1: You need to be logged into your linux machine with an id that has "db2profile" in it's .profile. If you are not sure what I'm talking about, look at the .profile of the db2 instance owner (usually db2inst1 unless you changed it during the install). The simplest thing would probably be to log in as the db2 instance owner. Once you are

How to create a function in DB2 that returns the value of a sequence?

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问题 How to create a function in DB2 that obtains a value from a sequence and returns it? It should be possible to use that function in select or insert statement, e.g: select my_func() from xxx insert into xxx values(my_func()) Basically I am using the sequence value in a complex formula, and I'd like to encapsulate the calculation inside a function. Edit: I am not asking how to simply get next value from sequence. 回答1: CREATE FUNCTION "MYSCHEMA"."MY_FUNC"(PARAM1 VARCHAR(4000)) RETURNS INT